共查询到20条相似文献,搜索用时 62 毫秒
1.
报道对氧的促进输送膜的研制和膜的性能测定工作。以Co(3FSalen)为氧载体,用简便的方法制备了聚砜-硅橡胶-氧载体复合膜;研究了制备方法和制备条件对膜渗透和分离性能的影响。实验结果表明,促进输送膜能有效地在提高氧氮分离系数α0/N的同时,也提高膜对氧的透气速率P0,采用混合固体氧载体的制膜方法也有独特的优点。 相似文献
2.
4.
5.
最近,斯特文斯技术研究所(Stevens Institute of Technology)的K·Sirkar教授在美国化学工程师协会上发表了一种用于气体分离的新型液体膜"CLMs"(Contained—Liquid Membranes)。它采用了聚丙烯中空纤维,但中空纤维的一半通过原料气,其余一半则反向通过载气——氦、氮等。在中空纤维外侧装满了水和盐水。它对于气体起“渗透”或““阻档层”的作用。 相似文献
6.
本文主要介绍了在利用原有 HCD试验装置的基础上增加 C-2H-2 O-2充气系统。在单一的TiN膜基础上开发新的膜系,并进一步论述了制备各种新膜系、前处理过程和制膜的工艺参数。新的膜系具有耐磨、耐腐、色泽鲜艳和成本低的特点。它展示了PVD法制备各种膜系的前景。尤其在当今的装饰行业更为突出。 相似文献
7.
8.
用于分离CO2的高分子膜 总被引:7,自引:0,他引:7
高分子材质的CO2气体分离膜大致可分为普通高分子和具有促进传递效应的促进传递膜两类,本文综述了这两类膜近10年来的研究进展,对一些主要膜品种的材料合成,制作工艺,物化和分离性能作了简要的介绍。 相似文献
9.
制奋了聚二甲基硅氧烷和多孔聚丙的复合膜,并分别用以分离O_2、N_2和以渗透汽化法分离乙醇—水混合物。结果表明,当复合膜较薄时,膜的选择性对气体保持不变,而对渗透汽化法却大幅度下降。说明尽管气体膜分离与液体混合物的渗透汽化分离都遵循“溶解扩散”机理,但是溶解和扩散对选择性的贡献在两种情况下,程度是不同的。计算了氧、氮、乙醇和水的透过活化能,分别为6.7KJ/mol、10KJ/mol、32.6KJ/mol和35KJ/mol.建议气体分离膜在室温操作而渗透汽化膜在较高温度操作。 相似文献
10.
钴卟啉络合物第五配位对富氧膜性能的影响 总被引:4,自引:0,他引:4
作为氧载体合成了中位-四卟啉合钴各合物。紫外-可见光谱有明,钴卟啉络合物在溶液中具有较强的吸氧能力。透气率和选择性的测定结果表明,钴卟啉络合物在PDMS膜中有一定的促输作用,当咪唑和吡啶作为钴卟啉络合物和第五配位时比第五配位为空位时的作用更明显,咪唑相比吡啶是更好的钴卟啉轴向碱基。 相似文献
11.
12.
《Separations Technology》1994,4(4):244-248
The flux of permeate in the separation by the direct-contact membrane distillation process as a function of membrane characteristics and operating conditions was considered. The expressions describing the vapor transfer through a hydrophobic membrane, the temperature at the surface of the membrane, and changes of temperature and concentration solutions along the module in the countercurrent device were derived and proposed. The theoretically predicted results show about 85–90% agreement with the experimental data. The utility of equations in the separation technology was pointed out. 相似文献
13.
14.
通过模型计算讨论了活性非均匀分布对促进传递器性能的影响。计算结果证明利用反应平衡常数沿轴向非均匀分布,可以使促进传递膜器分离性能较均匀分布时有所改进,不同操作条件和流动方式下的计算结果表明,为更充分地发挥促进传递作用,所选择的活性分布方式应使待分离组分在渗透气出口处更容易从膜内释放出来。 相似文献
15.
16.
17.
PVA/PVP/Ag+共混膜渗透汽化分离苯/环己烷混合物 总被引:3,自引:1,他引:2
PV/PVP/Ag+膜在苯、环己烷混合物中的溶胀实验发现,膜优先吸附苯,且膜中Ag+含量越大,膜在苯中的溶胀率越大,在环己烷中溶胀率越小.渗透汽化测试结果也表明,PVA/PVP/Ag+膜对苯/环己烷的分离性能明显优于PVA/PVP膜.而且,随着膜中Ag+含量的增加,膜的渗透通量J增大;分离因子先增大后减小,当膜中w(聚合物)∶w(AgNO3)=1∶1时,分离因子α达到最大值,为47.5,通量为7.8 g/(m2*h)(进料的质量分数为10%,20 ℃).而对膜进行交联改性后,分离因子可进一步提高,但通量下降. 相似文献
18.
19.
20.
The beneficial effects on peak selectivity and resolution of conducting liquid chromatography (LC) at elevated temperature (e.g., 30-80 degrees C) are generally well-known; however, its importance for peptide recovery is not nearly as well recognized. This report demonstrates that microLC analysis of membrane proteomic samples significantly benefits from the application of heat. Enriched membrane and membrane-embedded peptides (the latter obtained by membrane shaving) were analyzed by microLC-tandem mass spectrometry (MS/MS) from 20 to 60 degrees C using a standard reversed-phase material. Maximal protein and hydrophobic peptide recovery was obtained at 60 degrees C. The membrane-shaving method employed, a recently optimized version of the high pH/proteinase K protocol, provided significant integral membrane protein enrichment: 98% of identified proteins were predicted to have at least one transmembrane domain (87% to have at least three), and 68% of peptides were predicted to contain transmembrane segments. Analysis of this highly enriched sample at elevated temperature increased protein identifications by 400%, and peptide identifications by 500%, as compared to room-temperature separation. Given that most microLC-MS/MS analyses are currently conducted at room temperature, the findings described herein should be of considerable value for improving the comprehensive study of integral membrane proteins. 相似文献